I'm using Debian stretch x64 with Gnome 3.16 on a 27" screenw ith 4k resolution. Scaling with IntelliJ IDEA was perfect when enabling -DHidpi=true in vmoptions until release 142.3553.1.
The changelog reports: "True HiDPI support for Windows and Linux". It is used to work without any additional setup, but for me it doesn't. Menu text scaling is fine, but icons and editor fonts are too small. I can change the editor font of course, but how can I scale the icons in the newest build?